The Windows API

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The Windows Application Programming Interface (API) is a set of Windows functions that can be incorporated in your program. The API functions are stored in DLL's such as gdi32.dll, kernel32.dll and user32.dll.

These DLL's are the major ones responsible for the Windows operating system, but there are others. You can use the functionality of these DLL's in your programs without having to import components or references to your project.

To use one of the API function calls, it must first be declared using the Declare statement. The function is then used like any other function in Visual Basic. If the function is declared within a Form Module, it must be explicitly declared Private, or if used in a module, you can specify Public to make it available to other modules within the project. The API Text Viewer that comes with Visual Studio can be used to create the declaration statement.

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